[irox]

I followed the instructions on the repair kits, IIRC this involved drilling/melting a hole at the end of each crack, roughing up the areas around the cracks with coarse sand paper, and wipe everything down with acetone (or similar), before applying. I'm sure all that prep helped the JB weld work.

I remember hearing about Magnum Steel as well, I think I couldn't find it locally and went with something similar.

Cheers,
Ian.